[Solved] What happens if a Kafka Streams application uses exactly-once processing but disables transactions? — Ans: Exactly-once guarantees are lost; duplicates may occur | Kafka

Kafka - Advanced Stream Processing

What happens if a Kafka Streams application uses exactly-once processing but disables transactions?

AExactly-once guarantees are lost; duplicates may occur

BProcessing is still exactly-once due to idempotence

CApplication fails to start due to config error

DOffsets are committed automatically without duplicates

Step-by-Step Solution

Solution:

Step 1: Role of transactions in exactly-once
Transactions group writes and offset commits atomically, preventing duplicates.
Step 2: Effect of disabling transactions
Without transactions, duplicates can occur despite idempotence.
Final Answer:
Exactly-once guarantees are lost; duplicates may occur -> Option A
Quick Check:
Transactions off = no exactly-once [OK]

Quick Trick: Transactions must be enabled for exactly-once [OK]

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What happens if a Kafka Streams application uses exactly-once processing but disables transactions?